Clamp and die for punches



(No Model.)

J. N. KELLY.

GLAMP AND DIE POE PUNUHES.

No. 390,868. Patented Oct. 9, 1888.

Ill

JOSEPH N. KELLY, OF SPRINGFIELD, OHIO.

CLAMP AND DIE FOR PUNCHES.

Q SPECIFICATION forming part of Letters Patent No. 390,863, dated October 9, 1888.

(No modeLl To all whom it may concern:

Be it known that I, JOSEPH' N. KELLY, a citizen of the United States, residing at Springfield, in the county of Clark and State of Ohio, haveinvented certain new and useful Improve ments in Clamps and Dies forPunches, of which the following is a specification.

My invention relates to improvements in dies and clamps for punches.

The object of my invention is to provide a combined clamp and die particularly adapted for holding round metal during the operation of punching the same, means being provided for guiding the punch accurately .to the point at which the opening is to be made thereby, the constructions being also adapted in a modified form to be used for clamping and holding fiat or other shaped metal for punching. I

My invention consists'in the various constructions and combinations of parts hereinafter described, and set forth in the claims.

In the accompanying drawings, which form a part of this specification, Figure l is a perspective view of a die and clamp embodying my invention, the punch-stock being shown therein. Fig. 2 is a vertical sectional elevation View of the same with the drill-stock removed. Fig. 3 is a side elevation view of the clamping-jaws and dies and the sustaining-nut in detail. Fig. 4. is a detail View of a punchstock and punch, certain parts being shown in section. Fig. 5 is a detail sectional elevation view of a clamp and die in a modified form as adapted to punching flat metal.

Like parts are indicated by similar letters of reference throughout the several views.

In the said drawings, A represents an outer casing or shell, preferably cylindrical in form and provided on either side with circular openings A A diametrically opposite each other. Located within the outer casing, A, are the clampingjaws B B, each provided with a semicircular-notch or groove, on a, adapted, when closed together,to form an opening which stands opposite and forms a continuation of the openings A A in the outer casing. The lower jaw, 13, when in positionfigstands flush with the bottom of the casing A, and is preferably secured in this position by a small setscrew, 6. The upperjaw, B, fits loosely in the said casing, and is adapted to be raised vertically therein, a spline-key, I), being used to prevent the same from turning. The upper part of the casing A is turned down to form a neck, A, which is screw-threaded to receive a cap, O, correspondingly, internally screwthreaded to fit on said neck. The cap 0 is provided at the upper end with an opening, O, in which is placed a bushing, O Immediately under the bushing O is a chamber, O one side of which is cutaway, forming a semicircular opening, G

The upper part of the upper jaw,B,is turned down to form a neck, B, the upper portion of which is screw-threaded to receive a nut, B The neck B projects into the cap O, which is turned out to receive the same, after which the nut B is screwed onto the said neck, thus firmly connecting the upper jaw and cap,while at the same time the cap is permitted to turn in relation to said jaw. A handle, D, provided with a circular collar, D, fits over the cap 0 and is held thereon by a set-screw, e. The outer casing, A, is preferably adapted to fit in a base-piece, E, which is bored out to receive the same, a setscrew, 6, being provided to hold said casing in position. The basepiece E is adapted to be supported on the punch-table and secured thereto in the ordinary manner. The punch proper, d, fits in a stock, F, which is provided at its lower end with a collar, f,and aclamping-ring,j,adapted to fit accurately in the bushing (J in the top of the cap 0. The clamping-ring f screws onto the stock F and in contact with a bushing, f through which the punch d is inserted. The punch d, after being inserted in the bushing f is forced into position in the stock F by screwing the clamping-ring f, the bushing 7 being preferably tapered on its outside I and adapted to fit in a tapered seat in said stock, so as to insure the punch to be properly centered in its proper place. The punch d is provided at the upper end with a small head, which fits intoa corresponding recess,f ,in the bushingf In order to bring the strain centrally on the top of the punch cl, and to pre vent the head d from being broken by the pressure thereon, the punch is rounded at its upper end, as shown at d in Fig. 4.

The operation of the device is as follows: The punch d having been inserted in the stock F, as described, and the stock secured to the moving plunger of the punch in the ordinary manner, the clamping device and die are set on the table of the punch in such a position that the punch and stock enter the clamp and cap, respectively. Thisinsures the clamp and die to be centrally located on the punch-table and in relation to the punchingplunger without any other adjustment. The baseE is then fastened securely to the punch-table and the device is ready for use. The rods or bars to be punched are inserted through the openings A and A of the casing A and between the jaws B B. A turn of the handle D forces the said jaws tightly against said bar. The punch is then thrown into gear and descends through the opening 0 in the upper cap, B, the punching or chip being discharged through an opening, 0, in thelower clamp, B. It will be seen that by this construction the work is held firmly in place during the operation of punch ing. The punch and stock is carried accurately to the point where the punching is to occur. It is also supported firmly against lateral movement, thus preventing breakage of the punch and permitting the use of a small punch through heavy material,

By reason of the chamber 0 and the opening 0 therein, in the event that a punch be comes broken the piece which is broken from the same, owing to the pressure thereon, will be forced into the chamber 0, and, following the curved walls of the same, will be discharged through the opening C, thus pre venting a further breakage of the punch or stock.

It is obvious that the same device in a modified form may be used for punching other metals than round. In Fig. 5 a clamp and die adapted for punching flat metal are shown. The outer casing, A, in this form is substituted by a curved support, G, and the grooves a a and the openings Aand A may be dispensed with, the clamps B 3' being otherwise sub stantially the same.

Having thus described my invention. 1' claim-- 1. In a clamp and die for punches, the up per and lowerjaws, as described, one of which is adapted to form a die and the other a guide for the punch, a screw-threaded cap attached to the upper jaw, and means for turning the same to raise and lower said jaw, substantially as specified.

2. The combination, with the outer casing, of the upper and lower jaws adapted to form, respectively, a guide and die, as described, a screw-threaded cap attached to the upper jaw and provided at the top with a bushing to receive the punch-stock, and an open chamber under said bushing, substantially as specified.

3. The combination of the upper and lower jaws adapted to form, respectively, a guide and die, as described, a screw-threaded cap adapted to move said uppcrjaw, a handle attached to said screw-threaded cap, a bushing in the upper part of said cap, a punch-stock adapted to fit said bushing, and a punch provided with a rounded head secured in said punch-stock and adapted to fitin the opening .in the uppcrjaw, substantially as specified.

4. The combination, with the outer casing having the diametrically-opposite openings therein, of the upper and lower jaws having grooves which extend opposite to said open ings, a screw-threaded cap on the top of said casing connected to said upper jaw, as described, so that a revolving movement of said cap will produce a vertical movement ot said upperjaw, and a handle adapted to turn said cap, substantially as specified.

5. The combination, with a clamp and die, as described, having the upper cap with a bushing therein, and an open chamber under said bushing, ofa punchstock having a clamping-ring and bushing in the end thereof, and a punch with a rounded head adapted to lit in the said punch-stock, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand this 20th day of August, A. D. 1888.

JOSEPH N. KELLY.

Vitnesses:

AL. 11. Knnlqimc, W. I. Guovn. 

